200 ZOOLOGISCHE MEDEDEELINGEN — DEEL I. 



1 2 



c? 9 



Distance between external orbital angles. . . . 27.8 22.2 



Greatest breadth of carapace posteriorly .... 30. — 25. — 



Length of carapace 23.2 19.6 



The species attains the same size as M. japonicus. 



M. japonicus de Haan. (PL IX, Fig. 14). 



1835. Ocypode (Macrophthalmus) japonica de Haan. Fauna japonica, Crust., 

 p. 54, pi. 7 f. 1 (9, sub nomine O. (M.) depressa) pi. 15 f. 2 ') 

 (c?) (Japan). 



1847. M. japonicus Gray. Cat. Crust. British Museum, p. 38 (Japan). 



1848. „ japonicus Adams & White. Zool. Voy. „Samarang", Crust., p. 51 



(Meiacoshima), 

 1852. „ japonicus H. Milne-Edwards. Ann. Sc. nat., sér. 3, Zool., t. 18 



p. 158 (Japan). 

 1894. „ japonicus Ortmann. Zool. Jahrb. Abt. Syst., Bnd 7, p. 746 (Bay 



of Tokio and Nagasaki). 

 1897. „ japonicus Ortmann. Zool. Jahrb. Abt. Syst., Bnd 10, p. 343 (no 



record of locality). 



De Haan has excellently characterized this species. Carapace in its 

 greatest breadth (at the middle of the convex margin of the antero- 

 lateral teeth) about 1 '/ 2 the length, wholly covered with conspicuous 

 granules, except for the epi- and nasogastric area and the middle of the 

 cardiac area, the granules are largest on the hepatic regions. All the 

 margins are distinctly crenulate, which is most pronounced in the proxi- 

 mal half of the side borders. On the branchial regions we observe at 

 each side the same granular rows as are present in M. pacificus, M. de- 

 pressus and M. tomentosus, viz. a transverse row at the level of the postero- 

 lateral teeth, two longitudinal rows 2 ), parallel to the side margins and 

 an obliquely transverse row above the base of the posterior legs. The 

 granules composing these rows are not larger, rather smaller than the 

 surrounding ones, contrary to what is the case in M. tomentosus. Cara- 

 pace not much narrowed anteriorly (as in the latter species). Outer or- 

 bital angle somewhat more pointed, though scarcely projecting, antero- 



1) Not f. 3, as is mentioned by misprint in the text. 



2) The inner one of these is broken up in two rows, one behind the other, which forms a 

 certain very obtuse angle; this arrangement appears also in de Haan's figure of the male. 



